High-tension coil.



G. W. WACKER.

HIGH TENSION COIL.

APPLICATION FILED 0202221915.

Patented May 1, 1917.

UNITED STATES PATENT OFFICE.

GEORGE W. WACKER, 0F RUTHERFORD, NEW JERSEY, ASSIGNOR TO AUTO-FED CO1VI- PANY OF AMERICA, A CORPORATION OF DELAWARE.

HIGH-TENSION COIL.

Specification of Letters Patent.

Patented May 1, 1917.

Application filed December 23, 1915. Serial No. 68,445.

To all whom it may concern:

Be it known that I, GEORGE WV. WAOKER, a citizen of the United States, residing at Rutherford, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in HighTension Coils, of which the following is a specification, reference being had therein to the accompanying drawings, forming part thereof.

My invention relates generally to hightension coils and relates particularly to means for making electrical connection of an outside conductor to the fine winding of such a coil, and my invention yet more particularly relates to the making of such a connection to the high tension coil or spark coil of a magneto such as is employed for ignition purposes in connection with the in ternal combustion engines of self-propelled vehicles. Other features of construction appearing in the magneto illustrated in the accompanying drawings as embodying my present invention form the subject of three other applications for patent filed by me on even date herewith, of which Serial No. 68,443 relates to the armature construction more particularly, Serial No. 68,444 to the circuit breaker of the magneto, and Serial No. 68,446 to the elimination of disturbing electrical and magnetic effects.

Heretofore in manufacturing high tension coils for magnetos, the common practice has been to connect the free end of the fine wire forming the high tension winding, which, for example, may be number thirty-six wire, to a slightly coarser wire, which, for example, may be number twenty-four, and in turn the end of this somewhat coarser wire is connected to a still coarser wire, for example, to a number eighteen wire, which last or coarsest wire is brought out to the outside of the insulating covering of the coil for the purpose of making the outside connection, this coarsest wire being of sufiicient strength not to break by reason of the vibrations of the engine and motor vehicle or for other reasons. However, the manufacture of a high tension coil in this way is rather expensive, because of the fact that it is necessary to stop the winding machine in order to connect together the ends of the different successively larger and larger wires. Objects of my present invention are to overcome the above-noted objection and to provide simple, reliable and economical means for connecting the high tension winding to an outside conductor which in turn may be connected to a usual distributer or to a spark plug of the internal combustion engine of the self-propelled vehicle. Other objects and advantages of my invention will hereinafter appear.

My invention includes a connecting member having special features of construction and combined with the high tension coil in such manner as to form the terminal of the winding of such coil and to be held in place by the insulative covering of the coil. My invention further includes features of construction and combinations of parts as will appear from the following description.

I shall now describe the magneto embodying the high tension coil of my invention illustrated in the accompanying drawings and shall thereafter point out my invention in claims.

Figure 1 is an elevation partly broken away and with parts in section of a magneto embodying my invention. Figs. 2, 3 and 4 are elevations illustrating successive stages in the manufacture of the high tension coil of my invention, which as completed appears at the left in Fig. 1.

Fig. 5 is an inverted plan of the completed coil as it appears from below in Fig. 1.

Fig. 6 is a perspective view of the connect ing member or coil terminal included in my invention.

Fig. 7 is a central section of a conductoratt-aching clamp appearing in Fig. 1.

The construction involved in my present invention can be most clearly understood by describing the successive steps or stages of manufacture with which the improvements of my invention are directly concerned. As the high tension coil 1 appears in Fig. 2 of the drawings its usual winding of fine insulated wire 2 is exposed to view. To prevent the fine wire 2 of the coil 1 from unwinding or unraveling during subsequent operations of manufacture, the end portion of this wire is fastened down by means of a small piece of courtplaster 3. A thin insulating covering 4 is next applied over the winding of the coil 1 and this insulating covering 4 may conveniently be a winding of thin silk insulating tape, this being the insulating material employed in the construction illustrated in the drawings. The free end of the fine high tension wire 2 is permitted to project beyond the insulating winding 4, as appears in Fig. 3.

In accordance with and as an important feature of my invention, I employ a particular kind of connector piece or end ter- 7 minal, the construction of which is perhaps has an attaching base a and a projecting connection-making prong or tongue Z) which is struck up from the base a inwardly from an edge thereon so as to project, as shown, substantially at right angles from about the center of such base a, so that the base a thus forms a sheet metal fiange around the pro jecti'ng prong 7), however, a notch, of course, being left in this base fiange a inwardly from its edge at the side from which the connection-making prong b is bent up, as clearly appears in the drawings. The base a is nearly flat but is preferably slightly bent or curved, as shown, so as to fit closely upon the correspondingly curved surface of the coil 1.

In the magneto construction illustrated in the drawings, the high tension coil 1 is of flattened oval form in cross-section, and for constructive reasons the connection-making member 5 is shown as applied upon the edge or more greatly curved surface of the coil 1. The thin base a of the sheet metal connectionmaking terminal member 5 is applied at the outside of and upon the comparatively thin inner insulating covering 4, as appears in Fig. 6% at this stage of manufacture and as also appears in other figures of the drawings. The end of the projecting end portion of the fine high tension winding or wire 2 is connected to the base a of the member 5, for example by solderingthe free endof this wire 2 to the outer side of the base a as is clearly illustrated in Fig. 4 where the attaching solder 6 is shown. The fine wire 2 forming the high tension winding of the high tension coil 1 is quite delicate in that it has very little strength because of its extreme fineness and by reason of this only a very slight movement or pull upon this fine wire 2 would result in its breaking. In carrying out my invention the free end portion of the fine wire 2 the end of which is connected to the base a of the connector piece 5 is not drawn taut, but on the contrary suflicient slack is provided in the wire 2 adjacent to the connecting member 5 so that any movement of the connecting member 5 which might take place in course of manufacture or to a. slight extent even afterward, due to vibration or other reasons, will not put a strain upon the delicate fine wire 2. In the construction illustrated in the drawings, this slack is shown as provided by means of a loop in the wire 2, as clearly appears in Fig. 4.

After the soldering .of the end of the fine wire 2 to the base a of the connector piece 5 and the placing of the latter with its base a resting upon the outside of the inner insulating covering l, as illustrated in Fig. 4?, a strong and comparatively thick outer insulating covering 7 is applied to the coil 1 over the inner insulating covering 4 and over and covering the slack-providin loop of the wire 2 and also over and covering and firmly holding in place the base a of the connector piece 5, as clearly appears in Figs. 1 and 5 of the drawings. In the construction illustrated in the drawings, the outer insulating covering 7 is composed of a winding of heavy linen insulating tape such as is commonly employed in the art. The thin fiat connection-making tongue or prong b of the sheet metal terminal member 5 projects to the outside through the outer insulating covering 7, as is shown in Figs. 1 and 5. In this connection it is to be noted that at any place where it may become necessary in effecting the winding of the tape forming the covering 7, the tongue 5 may project through a slit in the tape forming the cover 7 as is indicated in the drawings, more particularly in Fig. 1. After the completion of the winding of the outer insulating covering 7, an outer dressing or coating of shellac or other suitable material such as is commonly employed in the art, is applied to the outside of the insulating covering 7 so as to present a comparatively hard and rigid as well as impervious outer surface which assists in more firmly holding the connection-making member 5 in place. During packing and shipment of the coil the flat tongue I) may be bent down fiat on the finished surface of the coil to avoid liability to injury.

A detachable clamping member 8 is provided for readily effecting the connection of an outside conductor such as 9, with the projecting end or tongue 6 of the connectionmaking member 5. The clamping member 8 is shown as provided with a bore at one end forming a socket in which the end of the outside conductor 9 is fixed, and at its other end the clamping member 8 is split or divided into bifurcations forming a slot in which the connection-making tongue 7) of the terminal member 5 is received and in which it is firmly and securely held by means of a screw 10 screw threaded into one of the bifurcations of the free end of the clamping member 8 as shown in Fig. 1. Preferably both of the sides or bifurcations of the free end. of the clamping memberS are provided with screw-threaded holes, as is illustrated in Fig. 7 thereby conveniently permitting the clamping screw 10 to be inserted from either side of the clamping member 8 that may be most convenient at the time. The bare end of the outside conductor 9 may be soldered to the adjacent surface of the socketed end of the clamping member 8 as is indicated in Fig. 1.

In the magneto construction embodying my invention illustrated in the drawings, the armature of which the high tension coil 1 forms a part and which has also an armature core 11 and an armature frame 12, 1s stationary and is mounted upon a stationary sleeve 13. The field, comprising semi-circular magnets 14 having polar extensions or pole shoes 15, is rotative, the magnets 14 being carried by a non-magnetic shell 16 on a rotative shaft 17. In this particular construction the rotative field forms the flywheel of an internal combustion engine of which the shaft 17 is the crank shaft, and the stationary armature-supporting sleeve 13 forms a part both of the engine and of the vehicle frame.

While my present invention has a wide application, it is of particular value in magnetos employed for ignition purposes on small and light motor vehicles, such as those of the motor cycle type. It will be noted that it provides strong and convenient means for connecting the end of a usual outside conductor, such as the conductor 9, to the end of the fine wire forming the winding of a high tension coil, such as the wire 2 of the coil 1. The construction is very inexpensive and will effectively withstand vibration without damage, while providing for the quick attachment or detachment of the outside conductor.

winding, and an outer covering of insulation outside of the inner insulating covering and holding the said connecting member in place and through which the said connect ing member is exposed to provide for making an electrical connection with the winding of the high tension coil.

2. A high tension coil having, in combination, a high tension winding, an inner covering of insulation outward from such winding, a connecting member having a base resting on the said inner covering of insulation and having an outwardly projecting connection-making prong, the end of the high tension winding being electrically connected to said connecting member with a reverse loop in said end of the winding to provide slack .and avoid strain, and an outer covering of insulation outside of the inner covering and outside of and holding in place the base of the said connecting member and through which the connectionmaking prong of the said connecting member projects and is exposed for effecting an electrical connection with the winding of the high tension coil.

3. A high tension coil having, in combination a high tension winding of fine wire or the like, an inner covering of insulation outward from such winding, an outer covering of insulation outward from the inner insulating covering, and a sheet metal connecting member having an enlarged base held in place between the two said layers of insulation and with which the end of the winding is in electrical connection and to which it is attached with the provision of slack in the winding adjacent to the connecting member, and the connecting member having a flat tongue projecting to the outside of the outer covering of insulation for effecting an electrical connection by means of the connecting member with the high tension winding.

4:- A high tension coil having, in combination, a high tension winding, an insulating covering for such winding, a sheet metal connecting member to which the end of such winding is connected, such connecting member having a flange-like base held in place by the said insulating covering and having a fiat connection-making tongue projecting to the outside of the said insulating covering, and a split screw-clamp for attaching a conductor to the said tongue of the connecting member.

5. A high tension coil having, in combination, a high tension winding, an insulating covering for such winding and a con- 110 necting member to which the end of such winding, is connected, such connecting member having a supporting base held in place by the said insulating covering and having a connection-making fiat prong projecting to 5 the outside of the said insulating covering.

6. A high tension coil having, in combination, a high tension winding, an insulating covering for such winding, a connecting member to which the end of such winding is 120 connected, such connecting member having a supporting base held in place by the said 1nsulating covering and having a connectionmaking fiat prong projecting to the outside of the said insulating covering, and a de- 125 tachable clamping member for attaching a conductor to the projecting prong of the said connecting member.

7. Means for making electrical connection to the end of the fine winding of a 130 high tension coil, such means comprising a sheet metal connecting member having a projecting connection-making tongue struck up inwardly from an edge of a supporting base so as to project substantially at right angles from substantially-the center of such base which forms a sheet metal base-flange signature.

GEORGE W. WVACKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

